Replacing the I/O Board | 51Replacing the I/O BoardWARNING: Before working inside your computer, read the safety informationthat shipped with your computer and follow the steps in "Before You Begin" onpage 9. After working inside your computer, follow the instructions in"After Working Inside Your Computer" on page 11. For additional safety bestpractices information, see the Regulatory Compliance Homepage atdell.com/regulatory_compliance.Procedure1 Slide the I/O board under the tab on the palm-rest assembly.2 Align the screw holes on the I/O board with the screw holes on thepalm-rest assembly and replace the screws that secure the I/O board tothe palm-rest assembly.3 Slide the I/O-board ribbon cable into the connector on the I/O board and slide thelatches to secure the cable.4 Slide the I/O-board cable into the connector on the I/O board and slide the latchesto secure the cable.5 Connect the coin-cell battery cable to the I/O-board connector.Postrequisites1 Replace the mSATA/WWAN card. See "Replacing the mSATA/WWAN Card" onpage 35.2 Replace the battery. See "Replacing the Battery" on page 26.3 Replace the speakers. See "Replacing the Speakers" on page 24.4 Follow the instructions from step 2 to step 6 in "Replacing the Base Cover" onpage 15.